AvailableGBP179.99
https://www.zoro.co.uk/shop/measuring-and-test-equipment/micrometer-accessories/139-002-1-inch-micrometer-head/p/ZT1017084XDescription
139-002
Series 139 1" micrometer head. Can be used in conjunction with Series 139 extension tubes (not included).
Accuracy: ±[.00015+.00005n+.00005 (R/2)]. Graduation: .001".
n = number of rod. r = max measuring length. Fraction rounded up.
